Grader for beans, etc.



Mar. 6, 1923.

W. F. PROBST GRADER FOR BEANS, ETC

Original Filed June 16, 1919 5 sheets-sheeh 1 z. 5 5. i m

Mar 6, 1923.

W. F. PROBST GR ADER FOR BEANS, ETC

Original Filed June 16, 1919 5 sheets-sheet 2 azr. 6, 1923.

W. F.'PROBST GRADER FOR BEANS ETC ori inal Filed June 16, 1919 3 sheets-sheet 5 Patented Mar. 6, i923.

inane sa anna ron BEANS, are.

Application filed June 16,1919, Serial as. $4,582. Renewed August 9, 1922. Serial No. 580,805.

To all whom it may-concern:

Be it known that I, WILLIAM F. PROBST, a citizen of the United States, residing in Ohillicothe, in the county of Ross and State of Ohio, have invented new and useful 1m: provements in Graders for Beans, Etc, of which the following is a specification.

This invention relates to agrading machine which is more particularly designed for grading beans as to size although the same may also be utilized for grading other materials of like character.

Thet'ype orclass of'inachines to which the present invention belongs is, provided with a screen formed by a plurality of sets of grading needles which are arranged step fashion one below the other so that the beans or other material will fiow over the same from the head to the tail thereof in the form of a succession of f cascades. During this movement the smaller beans pass through the spaces between the sets of needles of the screen until the tail end of the same is reached atwhi-ch point the larger beans are 25 discharged. Some of the beans become caught in the spaces between the needles and thisnecessitates their removal in order to avoid clogging the machine and reducing its capacity. i v

In machines as heretofore constructed for this purpose the needles were usually sup ported only at their front ends which was objectionable for the reason that when the operator employed a rake forremoving the obstructing beans from between the needles the latter would often become displaced permanently and spread apart a distance greater than the normal separation between the same, thereby allowing'larger beans to pass through the screen than was intended and spoiling the grading elfect of the ma chine.-

One of the objects of this invention is to provide an improved grading-screen of this character in which the needles or bars are rigidly supported along practically their entire-length sothat they can not be deflected laterally by the movem'ento'f the teeth of the clearing rake between the same and thereby avoiding an improper separating efiect of the machine.

A further'object of this-invention is to provide an improved clearing mechanism which operates eifectively'to keep the screen clear of obstructions and ens'ures proper grading of the beans without making the machine unduly long.

Additional obj ects of this invention are'to improve the same in various detailsjof construction as will presently appear;

In the accompanying drawings: Figure 1 is a side elevation of a grading machine embodying a suitable form of my invention. Figure 2 is. a fragmentary horizontal section, taken on line 2 2, Fig. 1. Figure 3 is a fragmentary vertical longitudinal section, on an enlarged scale, of the grading screen, the clearing device co-operating therewith and associated parts. Figure 4 is a fragmentary vertical longitudinalsection, on a still larger scale, of a portion of the grading screen, taken lengthwise through several separating needles or bars of the screen,

Fignre 5 is a vertical transversesection, taken on line 5-5, Fig. l. Figure 6 is a vertical transverse section, on an enlarged scale, taken on line'6-6. Fig. 1. Figure 7 is a vertical longitudinal section, taken on line 77, Fig. 6, looking outwardly. Figures 8 and 9 are horizontal sections, taken on the correspondingly numbered lines in Fig. l. Figure lOis a detached longitudinal sectional elevation of one of the grading needles or bars.

Similar characters of reference refer to like parts throughout the several views.

11 represents the main frame of the machine which may be of any suitable construction and material to support the various working parts of the machine. Within the lower part of this frame is arranged a horizontally and longitudinally shaking shoe 12 having the form of an inclined box or body which is open at its top and is closed at its longitudinal sides and transverse ends, and is provided with an inclined bottom 13. This shoe is mountedso as to becapable of horizontal and longitudinal vibration in the main frame this being accomplished by con-- necting the same with the upper ends of the spring supporting arms 1d the lower ends of which are connected with the lower parts of the main frame. An oscillating movement may be imparted to this shoe-by any suitable means from a main driydngshaft 15, for instance, by a pair'of eccentrics 16 mounted on this driving shaft and two eccentric straps 17 embracing the eccentrics and connected by resilient bars or connecting rods 18 withthe underside of the body ofthe. shaking shoe. The shaft 15 may be rotated in any suitable manner, for instance, by a driving belt passing around a pulley 19 on one end of the drivingshaft.

Within the body of the shaking shoe is ar ranged the grading screen which embodies my invention and which is constructed as follows: i p 20 represents a plurality of upright longitudinal supporting plates which are arranged in a transverse row and equi-distant throughout the length thereof and each having its upper edge constructed in the form of a succession of steps or longitudinal treads 21 each of which is somewhat higher than the step of the next lower. tread and that portion of each supporting plate between the rear'end-of the one tread and the front end of the next lower tread being preferably constructed in the form of an upright riser 22 as shown in Fig. at} These supporting plates are preferably constructed of very thin material such as sheet metal and the same are spaced apart so as to be retained in a definite relation relatively to each other by a plurality of sets of spacing blocks 23, the members of each set being arranged in a transverse row between the several supporting plates. These spacing blocks are clamped between the several supporting plates and also held against turning by a pair of tie rods 24 passing through the several supporting plates and each set of spacing blocks and provided at their opposite ends with screw nuts 25 which bear against the outermost supporting plates, as shown in Figs. 3, 4e and 11.

26 represents a plurality of sets of longitudinal grading needles .or bars, the mem bers of each set being arranged in a transverse row, and the several sets being arranged step fashion with reference to each other, so that the rear end of each set of needles, except the lowermost, overhangs the front end of the set of needles next following. Each of these needles is mounted upon one of the treads of the step shape supporting plates so that this needle is supported practically throughout its entire length. For this purpose each of these needles is preferably constructed of tubular form and provided on its underside with a longitudinal slit 27 which permits the same to be slipped over one of. the steps of a supporting plate so that a riser portion of the latter extends from the underside of the re spective needle upwardly and diametrically across the same into engagement with the inner side of the upper portion of this needle, as shown in Figs. 4 and 5. The upper front part of the needle is also provided with the short longitudinal slit 28 which together with the front part of the lower longitudinal slit permits the front end of the needle to straddle or receive that part of the step of a separating plate arranged at the lower end of one of the riser edges and the front end of a tread edge, as shown in Figs. 3, a and 9. The rear end of each needle is preferably cut off perpendicular to its axis so that it ends abruptly but the front end 29 of the same is preferably tapered or pointed forwardly so that any beans or other material which are. being graded will not be liable to catch against the front end of the needle and interfere with the free passage of the same. Each of these grading needles is preferably constructed of sheet metal and secured to its respective supporting plate by brazing, soldering or otherwise. The width oft-he screen is preferably such that it completely fills the space within the bodyor box of the shoe crosswise so that any material which is deposited upon the screen will be confined against lateral displacement thereon. hen a mass of beans or other material is delivered upon the head end of the screen some of the smaller beans in this mass upon sliding over the firstv screen will pass through the spaces between the needles thereof and drop upon the bottom of. the shoe body. As the remaining mass of material drops from the first set of needles to the second set an additional quantity ofsmaller beans will pass through the-spaces between the second set of needles. This operation is repeated as the remaining masspasses from the rear end of one set of needles upon the next following set so that in its passage from the head to the tailscreen, all of the smaller beans, will pass through the screen while the larger beans will be discharged from the tail end thereof. The rearends of the needles of each set overhang the front ends of the needles of the next following set, so as to positively prevent any material from passing over the screen without being sub-- jected to its grading effect. The material to be separated may be delivered upon the head of the screen in any suitable manner, for instance, by means of a feed plate 30 arranged within the upper or receiving portion of the shoe body and overhanging the upper end of the screen so that the material delivered upon this feeding plate will he directed. upon the screen.

Immediately in front of the tail end of the screen the chamber 31 within the box of the shaking shoe below the screen is provided with a delivery chute or spout 32, through which the smaller beans or other material passing through the screen discharged into somereceptacle, and immediately .in rear of the tail end. of the screen the body of the shoe is provided with another chute or spout 38 which receives the large beans or other material vwhich does not pass through the screen and delivers. the same intov suitable receptacle provided for that In order to prevent any material which passes through the screen from lodging. on the spacing blocks the upper sides of;: the latter are made of-rounded or convex form, as shown at 341m Figs; 3 and 4, thissurface operating todeflect or shed any material which may strike-the sameand cause it to drop on the inclinedabottoin of the shaker body so that the latter may guide the same to the outlet chute or spout '32,

In order to permit of conveniently raising the screenso that its underside is accessible for inspection, cleaning. or repairs, this screen ispreferably pivotally supported at its upper end by meansofa horizontalshaft or rod which passes transversely through the upper ends of the several supporting plates andthe longitudinal walls of the-shoe body, as shown in Figs: 1 and 3, thereby enabling the lower or rear end of the screen to-b'eraised whenever desired. p

The downward swinging motion of this screen is limited and it is supported in its normal operative position by providing, the inner sides of the longitudinal walls of the shoebody with two str-ips or cleats 36 which form upwardly facing shoulders uponwhich the sidemost supporting plates ofthe screen rest in the operative position of the-latter, as shown in Figs. 3 and 6. i

For the purpose of clearing: the machine of any beans or similar material which may be caught between the grading needles or bars of the several sets, meansare' provided which embody my invention and which are preferably constructed as follows: i

37 represents a transverse row of vertical teeth which have their inner ends se cured across the head 38 soas to form a rake shaped clearing member whereby the material which is caught between the needles of" the screen is removed, this effect being produced by moving the rake downwardly over the screen in such position that=each of its teeth passes lengthwise through the longitudinal spaces between the several sets of teeth; This rake is moved downwardly in thisma nner with an idle stroke-andthe'n elevated and moved backward idly with'a return stroke to the place of beginning its active stroke. The means whereby this is accomplished comprises twoendless belts 39 preferably of chain type and having up per: and lower stretches arranged lengthwise on opposite sides of the mainframe; The crossbar of the rake is mountedon the op posing inner sides of these beltsby-"pivoting opposite ends of-th'is bar on cor-responding links of the cha-in and providing this bar with retaining arms 40 which projectlater ally therefrom-and are provided with longi tudinal slots 41 which receive the pin;42- on the adj'ace'ntlinesof these chains. By this means the teeth; of the rake are retained-in avertical position relatively to the scre'en} as this rakepasses through the spaces orslots between the several needles for clearing out any obstruction which may have clogged the same. The carrying belts 39 pass at their upper front and their lower rear turns around front andv rear pairs of sprocket wheels 42', 43which are secured to horizontal shafts 4A 45 arranged transversely above the screen and journaled in suitable bear ings on the adjacent parts of the main frame. In order to maintain the operative lowerand inoperativev upper stretches of the chain belts in a straight condition while traveling from one pair of sprocket wheels to the other, these portions of these chain belts are guided in longitudinal guideways 46, 4L7 which areof channel or U-shape form in crosssection and secured to the adjacent parts of the main frame so that the guides of one chain belt open with their concave sides toward thecorresponding sides of the guides for the other chain belt.

Means are provided for actuating the chain belts whichsupport the rake so that the latter while moving through the screen and up to nearly its tail end during its operative stroke, will travel at a comparatively high rate ofspeed, but while completing its movement at the tail end of the screen and returning on the upper idle stretch of the chain-belts the same will travel comparatively slow. By this means the screen can be cleaned rapidly without liability of throwing the beans or other material from the tail end of the screen into the chute 33 andpossibly choking the same and also avoiding carryingsome of the beans from the screen upwardly to the upper idle stretch of the belts, thereby enabling the length of the machine to bematerially reduced for a certain capacity. This intermittent slow and rapid motion of the rake may be obtained by means which may be variously constructed but those shown in the drawings are preferred and constructed as follows 48 represents a short counter shaft arranged transversely and horizontally adjacent to the rear part ofthe machine on one side thereof; and iournaled in suitable bearings' formed ina bracket 49 whichis secured to; the adjacent part ofthe main frame. The slow motion is imparted to this counter shaft by meansofan intermediate longitudinal shaft5 0 journaled on the main frame and connected atits front end with the" main driving shaft by means of a pair of interme'shing bevelgear wheels 51, 52 while itsrear end is operatively connected. with. the

counter shaft means-of a bevel gear pinion 53-se cured to the rear end of the' longitudina'lshaftand meshing with a large 'be'vel gear wheeled secured to the counter shaft, as shown-in lligsl 2,.6-an'ol}7. Atits outer end the: counter shaft is provided with a low speed gear pinion which meshes with a large low speed gear wheel 56 mounted loosely on the adjacent part of the shaft 45 which carries the lower sprocket wheels of the chain belts. The driving connection is produced between the large high speed gear wheel 56 and the driven sprocket shaft 45 by means of a ratchet mechanism having a ratchet wheel 57 secured to the inner side of this gear wheel and preferably provided with two teeth 58, a ratchet arm 59 secured to the shaft 45 adjacent to the ratchet wheel, and a coupling pawl or dog 60 pivoted on the ratchet arm and yieldingly held in engagement with the toothed surface.

of the ratchet wheel by means of a spring 61 interposed between the ratchet arm and the pawl or dog, as shown in Figs. 6 and 7. When the motion is transmitted from the main driving shaft to the chain belts solely through the longitudinal shaft, thecounter shaft and low speed gear pinion 55 and gear wheel 56, the rake is moved slowly over the tail end of the screen and over the delivery chutes 32, 33 also slowly backwardly with the idle stretches of the chain belts. The movement however, of the rake from the head of the screen to a point short of its tail end is very rapid so as not to interfere with the grading operation. ,The mechanism whereby this rapid motion of the rake is obtained is preferably constructed asfollows: 67 represents a driven high speed gear pinion secured to the shaft 45 of the delivery sprocket wheel adjacent to the inner side of the large low speed gear wheel 56. On the counter shaft is mounted a'mutilated gear wheel 62 having a diameter which is preferably several. times greater than that of the high speed gear pinion 67. This mutilated gear wheel is splined on the counter shaft so as to be compelled to turn therewith but capable of moving lengthwise thereon for the purpose of bringing the mutilated gear wheel into and out of line with the high speed pinion 67. The mutilated gear wheel is yieldingly held in a position in which it is out of line with the'high speed gear pinion by means of a spring 68 surrounding the counter shaft and hearing at its opposite ends against the mutilated gear wheel and the bevel gear wheel 67, as shown in Fig. 6. r

The means whereby the mutilated gear wheel is moved intermittently into line with the high speed pinion 67 comprisesastar wheel 69 pivoted on the bracket 49 and having a cam 70 on one side which is adapted to engage with the hub of the mutilated gear wheel and shift the latter into line with the high speed pinion 67 once during each rotation of the star wheel, and means for turning the star wheel by motion derived from the low speed gear wheel 56 consisting preferably of twotappets or *pins 71 arranged on diametrically opposite sides of the low speed gear wheel and adapted to engage successively with the teeth of the star wheel. While motion is being transmitted from the main driving shaft through the high speed gear wheel 56 to the rake for effecting a slow motion of the latter the tappets 71 on the low speed gear wheel engage successively with the teeth of the star wheel and turn the same forwardly step by step until the cam engages with the hub of the mutilated gear wheel and moves the latter into line with the high speed pinion 67. Theshifting of the mutilated gear wheel into this position occurs when the front end of the segmental row of gear teeth of the mutilated gear wheel is arranged adjacent to the high speed gear pinion 67 so that during the con tinued rotation of the mutilated gear wheel, its teeth will engage with those of the pinion 67 and cause the delivery shaft of the chain belts to be turned very rapidly until the rear end of the gear segment of the mutilated gear wheel has cleared this pinion.

After the rear end of the gear segment of the mutilated gear wheel has cleared the high speed gear pinion 67 the cam of the star wheel has passed out of engagement from the hub of,the mutilated gear wheel, thereby permitting the spring 68 to again move the mutilated gear wheel out of line with the high speed gear pinion. -While the lower or rear shaft 45 of the sprocket wheels is being thus turned at a rapid rate by the mutilated gear wheel, the coupling pawl or dog of the ratchet arm is turned forwardly more rapidly than the ratchet wheel which is secured to the slow speed gear wheel 56 so that the coupling pawl or dog at this time moves idly without doing any work. But after the mutilated gear wheel has been again disengaged from the high speed pinion 67 the neXt following tooth of the ratchet wheel is caught by the dog or pawl and the low speed gear wheel 56 is again turned by the same slowly for causing the rake tojbe again moved at aslow rate of speed.

The mechanismwhich drives the rake is so organized that when the speed of the rake changes form a high to a low rate, there is a momentary pause or halt in the movement of the rake due to the ratchet pawl moving idly for a short period until it catches up with the next following tooth of the ratchet wheel. During this brief period of rest the rake is arranged near. the tail end of the screen and before it resumes its slow motionthe beans which have been rapidly gathered at the tail of the screen are able to escape through the rear chute 83 and thus avoid clogging the machine or scattering the beans.

This operation of moving the chain belts alternately with a high speed and a slow speedoccurs with sufficient frequency while the machine is in operation to retain the screen free from any obstructions and maintain the same in its higheststate of efficiency so as to secure the maximum output of the machine. a

The machine shown in the drawings is organized for making only two grades of beans or like material but if desired'the same can be designed for obtaining a greater number of grades but it is preferable to employ a separate machine for every two grades.

I claim as my invention:

1. A grader for beans and the like comprising a shaking body, and a screen mounted on said body and having a plurality of longitudinal needles arranged in a transverse row, and means for supporting said needles on their underside along practically the entire length of the same.

2. A grader for beans and the like comprising a shaking body, and a screen 1nounted on said body, and having a plurality. of longitudinal needles arranged in a transverse row and each having a pointed front end, and means'for supporting said needles on their undersides along practically the entire length of the same. i

A grader forbeans and the like comprising a shaking body, and a screen mount ed on said body and having a plurality of longitudinal needles arranged in a transverserow and. each of said needles being of tubular form and provided in its underside with a longitudinal slot, and means for supporting said needles comprising a plurality of upright longitudinal supporting plates eac'hiof which projects at its upper edge into one of said needles through the slot thereof.

4:. A grader for beans and the like comprising alshaking body and ascreen mounted on said body and having a plurality of longitudinal needles arranged in a transv rse ro and e Qh Q said ne dles beingno tubular form and having a slot on its underside extending the full length thereof and a slOt on its upper side arranged only on the front endthereolf, andmeans for sup porting said needles comprising a plurality of upright supporting plates each of which has its upper part projecting through the lower and upper slotsof one of said needles and into the inner side of the same.

5. A grader ifor beans and the like comrisin ashakin bod and a screehmountp C D 7 ed on said body and having a plurality of longitudinal needles arranged in a trans- .verse row, andmean for supporting said needles comprising a plurality of upright longitudinal plates vwhich are arranged in atransverserow and upon the upper edges of which said needles" are mounted, and means for spacing said plate apart.

-6. A grader for beans and the-like comprising a shaker body, and a sereenmounted on said body and having a plurality of longitudinal needles arranged in a transverse row, and means for supporting said needles comprising a plurality of upright longitudinal plates which are arranged in a transverserow and upon the upper edges of which said needles-are mounted, and means for spacing said plate apart comprising a plurality of spacing blocks arranged in a transverse row between said plates.

7. A grader for beans andthe like comprising a shaking body, and a screen mounted on said body and having a plurality of longitudinal needles arranged in a transverse row, and means for supporting said needles comprising a plurality of upright longitudinal plates which are arranged in a transverse row and upon the upper edges of which said needles are mounted, and means for spacing said plates apart comprising a plurality of spacing blocks arranged in a transverse row between said plates, and each of said blocks havinga convex upper side.

8. A grader forbeans and the like comprising a shakingbody, and a screen mounted on said body andhavi-ng a plurality of longitudinal needles arranged in a trans verse row, and means for supporting said needles comprising a plurality of upright longitudinal plates whichare arranged in a transverse row and upon the upper edges of which needles are mounted, and-means for spacing said plate apart comprising a plurality of spacing blocks arranged in a transverse row between said plates, ,and a tie rod extending transversely through said plates and blocks.

9. A grader comprising a shaking body, and a screen mounted on said body and including a plurality. of sets of needles, the needles of each set being arranged in a transverse row, and means afor pivotallysupporting the several sets of needles on said body so that they can be raised and lowered.

10. A grader comprising a shaking body, and a. screen mounted-on said bodyand including a plurality ,of sets of needles, the needles in each set being arranged in a transverse row, and meansior pivotally supporting the several sets of needles on said body so that they can be raisedand lowered comprising a plurality of upright longitudinal plates pivoted at their front ends on said body and supporting said needles on their upper edges.

11. A grader-comprising a screen having a plurality of longitudinal needles which are separated by intervening spaces and over which the material to be separated i,iows, and means for clearing-said spaces comprising a rake having teethmovable lengthwise through said spaces, and a cross bar connecting one end ofsaid teetlnand means for moving said rake comprising two belts on which opposite ends of said cross bar is pivoted, and arms secured to said cross bar and having a loose connection with said belts.

12. A grader comprising a screen having a plurality of longitudinal needles which are separated by intervening spaces and over which the material to be separated flows, and means for clearing said spaces comprising a rake having teeth movable lengthwise through said spaces, and a cross bar connecting one end of said teeth, and means for moving said rake comprisingtwo belts on which opposite ends of said cross bar is pivoted, arms secured to said cross bar and provided with longitudinal slots, and. pins arranged on said belts and engaging with said slots.

13. A grader comprising a screen having a plurality of longitudinal needles which are separated by intervening spaces and over which the material to be separated iiows, and means for clearing said spaces comprising a rake having teeth movable lengthwise through said spaces, an endless carrier upon which said rake is mounted, and means for guiding said belts.

1A. A grader comprising a screen having a plurality of longitudinal needles which are separated by intervening spaces and over which the material to be separated flows, and means for clearing said spaces comprising a rake having teeth movable lengthwise through said spaces, an endless carrier upon which said rake is mounted, supporting wheels around which said belts pass, and channel shaped guides which receive the stretches of said belts between said wheels. 15. A grader comprising a screen over which the material to be graded flows, a clearing member movable forwardly with a working stroke next to said screen and with an idle stroke away from said screen and actuating means for moving said clearing memberfast during a part of its working stroke and slow during its idle stroke.

16. A grader comprising a screen over which the material to be graded flows, a clearing member movable forwardly with a working stroke next to said screen and with an idle stroke away from said screen and actuating means for moving said clearing member fast during a part of its working stroke and slow during its idle stroke, said actuating means including a belt which is connected with said clearing member, supporting wheels aroundwhich said belt turns, a driven shaft connected with one of said wheels, a counter shaft, and means for transmitting either low or high speed from said counter shaft to said driven shaft.

17. A grader comprising a screen over which the material to be graded flows, a clearing member movable forwardly with a working stroke next to said screen and with an idle stroke away fromfsaid screen and stroke and slow during its idle stroke, said actuating means including a belt which is connected with said clearing member supporting wheels around which said belt turns, a driven shaft connected with one of said wheels, a counter shaft, and means for transmitting either low or high speed from said counter shaft to said driven shaft comprising a low speed driving gear pinion connected with said counter shaft, a large low speed driven gear wheel meshing with said low speed pinion and mounted loosely on said driven shaft, a ratchet mechanism interposed between said driven shaft and said lar e low speed driven gear wheel, and means for transmitting motion at a high speed from said counter shaft to said driven shaft.

18. A grader comprising a screen over which the material to be graded flows, a clearing member movable forwardly with a working stroke next to said screen and with an idle stroke away from said screen and actuating means for moving said clearing member fast during a partof its working stroke and slow during its idle stroke, said actuating means including a belt which is connected with said clearing member, supporting wheels around which said belt turns, a driven shaft connected with one of said wheels, a counter shaft and means for trans. mitting either low or high speed from said counter shaft to said driven shaft, comprising a low speed driving gear pinion connected with said counter shaft, a large low speed driven gear wheel meshing with said low speed pinion and mounted loosely on said driven shaft, a ratchet mechanism interposed between said driven shaft and said large low speed driven gear wheel comprising aratchet wheel mounted on said large low speed gear wheel, a ratchet arm secured to said driven shaft, and a pawl mounted on said arm and engaging with said ratchet wheel, and means for transmitting motion at a high speed from said counter shaft to said driven shaft.

19. A grader comprising a screen over which the material to be graded flows, a clearing member movable forwardly with a working stroke next to said screen and, with an idle stroke away from said screen and actuating means for moving said clearing member fast during a part of its working stroke and slow during its idle stroke, said actuating means including a belt which is connected with said clearing member, supporting wheels around which said belt turns, a driven shaft connected with one of said wheels, a counter shaft, and means for transmitting either low or high speed from said counter shaft to said driven shaft comprising a low speed driving gear pinion connected with said counter shaft, a large low speed driven gear Wheel meshing with said low speed pinion and mounted loosely on said driven shaft, a ratchet mechanism interposed between said driven shaft and said.

large low speed driven gear Wheel comprising a ratchet Wheel mounted on said large low speed gear Wheel, a ratchet arm secured to said driven shaft, and a pawl mounted on said arm and engaging With said ratchet Wheel, and means for transmitting motion at a high speed from said counter shaft to said driven shaft comprising a high speed gear pinion secured to said driven shaft, a large mutilated gear Wheel splined on said countershaft, a spring operating to yieldingly hold said mutilated gear out of line With said high speed pinion, a cam for moving said mutilated gear Wheel into line with said high speed pinion, a star Wheel carrying said cam, and a tappet arranged on said large driven low speed gear wheel and adapted to engage the teeth of said star Wheel.

WILLIAM F. PROBST. 

